Mounting for sheetlike articles



. Oct. 27, 1925. I Q 1,559,260 F. s. KOCHENDORFER' MOUNTING FOR SHEET LI KE ARTICLES Filed Jime 19, 1923 Patented Oct. 27, 1925.

UNITED STATES PATENT OFFICE.

FREDERIC S. KOCHENDORFER, OF RIVER FOREST, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED,

NEW YORK.

OF NEW YORK. N. Y.. A CORPORATION OF MOUNTING FOR SHEETLIKE ARTICLES.

Application filed June 19, 1923.

To r/ZZ trim/r1 5/ may rroneern:

Be it known that l, FREDEHIC Kt'ieniixnoia-icu. a eitizen ot' the United States, residing at River Forest. in the county of (Took and State of Illinois, have invented ertain new and useful Improvements in .\lountings tor hheetlike Articles, of whieh the tollowing is a full. elear. concise. and exact dtwription.

'lhis lllttllllOli relates to mountings tor sheet lilte artiele and more particularly to m untings l'or diaphragms.

In eertain types oi apparatus a sheet-like artiele is employed as a diaphragm upon whieh impulses are impinged. It is sometimes desirahle. espeeially where the diaphragm is u ed for the translation of eleetrit'al or meehanieal impulses into sound waves or the reverse. that the diaphragm he tautened. and tirmly held in this eondition.

In mounting a diaphragm hy means of a resilient gasket ol' eompressihle material seated hetween tlat snrt'aeed meinhers. it might happen that upon the drawing together ol' the meiuhers. there would he a tendeney to displaee a portion of the. gasket material toward the eenter. and this might earry the periphery ol the diaphragm with it. therein distorting the diaphragm.

.\n ohjeet ol' the present invention is to mount a diaphragm so as to tauten it. and to maintain it taut.

Another ohje t is to simplify the mount ing of a diaphragm in a taut condition.

In order to attain these olijeets there is provided. in aeeordanee with one embodiment of the invent ion. a eireular diaphragm. upport ed hetween two separable members, either or hoth ot' whit-h may hold a resilient gasket in intimate eoutaet with the diaphragm. the portion of the separable memhers l' rmiug the seat tor the. diaphragm being maehiued so as to slope outwardly away from the diaphragm. and having around their peripheries annular ehannels, or pockets. to provide a spare for receiving gasket material displaeed hy the drawing together of the separahle memhers.

An additional leature of the invention, which may he henelieially employed in the seatiu of larger diaphragms where a consideralile amount of gasket material is displaced upon drawing the parts together, is

Serial No. 646,447.

the provision of a lip, or ridge, on the central edge of the sloping gasket seat to still further retard displacement toward the een ter of the diaphragm.

These and other features of the invention not speeitieally mentioned will appear from the 't'ollowing deseription and the accompanying drawings. in which Fig. l is a seetional view of a telephone reeeiver ot' the loudspeaker type in which the present invention is embodied, portions thereof heing hroken away;

Fig. 2 show a partial section on the line L "*3 of Fig. 11

Fig. 2} shows an enlarged fragmentary section illustrating the seating ot' the gasket and assoeiated parts hel'ore they are completely assembled:

Fig. 4 shows a section corresponding to that of Fig. hut with the parts drawn together tightly. and

Fig. 5 is a view similar to Fig. 4 showing a modiled form of the invention.

Referring to the drawings in detail. a diaphragm lt is held in position hetween meniliers eomprising an annular rover memher l7. ot metal. and an annular meuihe-r ll. these two iuemhers heing eonueeted to eaeh other hy means ot' s rews l and nuts it on longer serews to. which are plaeed at; various points ahout the annular memhers hest seen in Fig. L.

It will he noted that the annular member H is so maehined that the central part ltl ot the tare adjoining memher 12 is higher than the outer part thereof, and that the diaphragm to to he mounted. rests upon this rai ed portion. The lower face of the annular t-o\er inemher l: is here shown eut away in the renter. hut the purpose ot this is merely to leave the diaphragm tree to vihrate.

In the eonstruetion ol' the gasket seat in memher 1;. an annular ridge :1 has its lower taee rut at an angle. so that the outer edge thereof is lower than the inner. and around this ridge is an annular ehanuel 'Jti. lit yond the channel is another ridge 2 a, higher "and hroader than the lirst. the lower t'aee of whit-h slopes in the opposite direction from that of ridge ll. namely. so that the outer edge is higher than the inner.

An annular gasket 22. of resilient mate rial, is held in place between the annular cover member 12 and the diaphragm 10, some of the gasket material being displaced into the channel 26 when the parts are drawn together.

A modification is shown in Fig. 5, where it will be noted that two annular members To and 76 substantially the same as those illustrated in the first four tigures are each provided with a gasket seat; that a resilient gasket 72 is mounted upon either side of the diaphragm 1t), and there is provided in addition a ridge 52, or lip, on the inner edge of each gasket seat. Except for these distinctions the moditied t'orm shown in Fig. 5 corresponds to that shown in the other views.

A cylindrical base member 32 is fastened to the annular mounting member 12 by suitable means, for instance. bolts 34, while a dust-proof housing 36, which surrounds the apparatus, used for translating electrical variations into sound waves, is held in close contact with an annular dust excluding member 38, which may be of rubber, by means of screws 40 fastened to brackets 42 extending from the annular cover member To describe briefly the structure with which the diaphragm is here associated, a soft iron armature 4-1 is suspended between electromagnets 50. the adjoining poles of which are of opposite polarity, and which. when a pulsating electrical current is passed through their coils 5t, produce a magnetic field of varying intensity. which sets up in the armature -t-t longitudinal torques corre sponding in period to the variations in the magnetic field surrounding the electromag nets, and the arm to transmits them, pistonlike. to the diaphragm ltt. causing it to vi brate in unison with the armature. and pro duce. in a well known manner. sound waves having a period corresponding to that. of the electrical variations through the magnet coils.

Small nuts -18 secure the arm to to the diaphragm which. as shown here, may he of built up layers of linen, impregnated with a hardening and preserving material. and impressed with concentric circular corrugalions.

The parts employed in scaling the dia phragm are. the annular members 1; and 14. the annular gasket 22. the diaphragm to. the screws ltt and 1H. and the nuts so.

The gasket should have an inside diameter approximately equal to the inside diam ctcr of ridge L'l. an outside diamcter equal to or perhaps a tritlc less than the inside diameter of ridge 2?. while the diaphragm should fit looscly within the ridge as. as should also the raised portion 30 ot annular member 14.

In assembling these parts the diaphragm is placed upon the raised portion 30 of member 14, the gasket 22 is placed upon the upper surface of the diaphragm, the cover member 12 is put in place, and the screws 18 and nuts 20 are turned down. Just before the parts come together they will appear as in Fig. 3, and when they are in their tinal position they ill appear as in Fig. l.

The outwardly toping lace of ridge it forces the displaced gasket material one wardly into the channel 26, and the tendency of this resilient material to resume its normal shape will act to draw the part in contact with the diaphragm outwardly and thus (3XtXt:- a continuous force on the diaphragm outwardly from its center which will tend to hold it taut.

Just before the parts reach their linal position the outer edge of ridge :0 will come in contact with the low portion of member 14, and a further drawing together of tilt parts will force the inner edge of the amm lar member it to he drawn toward the cour paratively intiexihle cover member 13, thc outer edge of the ridge 28 acting as a t'ul crum, thereby exerting a still further tautening etl'ect on the diaphragm.

From the description of the above structure and the method of assembling it. it is believed that the moditicatio-n illustrated in Fig. 5 will be readily com;irchcnded. It will be noted in this tigure that two gaskets are used instead of one. and. in addition. there is provided on the central cdge of each gasket seat. a small ri-rlgc .32 to still turther retard central displaccment ot' gasket terial.

To bring out the necessity tor a mounting which will hold a diaphragm taut, supposit or example. that upon being mounted. the periphery of a diaphragm ot the type ilhi. trated herein were torn-d inwaidlv ttmut'ii its center. This woill warp the diaphragm and cause it to cunc that the ccntcr thcrcot' would he calhcr higher or lower than the periphtn'y. llllll|l; tor the purpose of illu tration. that a diaphragm has becn mounted in a mauo r whi h has l'oicc l the upper suriace into a concave arch. and that the armature ti has been adjusted to havc an equal clearan tron: the magnets on either side. when the diaphragm is. sub jcctcd to the piston iihcactiou l thcl'o1t t the diaphragoo may. it] ome iti tuth'ts. dculv snap into a p s thn surt'acc is conwx.

Hiltmien; a loud Hrihc in distorted.

'hat is claimed is:

l. A mounting for a shcet like article comprisii'ig a resilient member. a mounting member having a pocket to allow therein displacement of the resilient member. and

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place the resilient member and tauten the article. I

2. A mountin for a sheet-like article comprising a resilient member, a mounting member having a ridge with a sloping face in seating relation to said resilient member, and a pocket adjacent to said ridge to permit displacement of the resilient member, and means to cause a relative movement between the mounting member and the article to displace the resilient member and tauten the article.

3. A mounting for a sheet-like article comprising a mountlng member, a resilient member between said mounting member and said article, a. projection on the mounting 1 mmber to resist displacement of the resilient member, and means to cause a relative movement of the article and the mounting member to tauten the article.

4. A mounting for a sheet-like article comprising a mounting member having thereon two ridges with oppositely sloping faces, a planiform member to act with one ridge to give a lever action to said planiform member, a resilient member in seating relation with the other ridge, and means to cause a relative movement between the mounting member and the planiform member to displace the resilient member and tauten the article.

5. A mounting for a sheet-like article comprising a plurality of resilient members, a plurality of mounting members, each having thereon a ridge with a sloping face in seating relation to a resilient member and a pocket adjacent to said ridge to allow displacement of said resilient member, and means to cause a relative movement of the mounting members to displace the resilient member and tauten the article.

6. A mounting for a diaphragm comprising a resilient member, an annular mounting member havin an annular ridge in seating relation to sai resilient member, said ridge having a projection on its inner edge to resist central displacement of the resilient member and a pocket around said ridge to allow outward displacement of the resilient member, and means to cause a relative movement between the mounting member and the diaphragm to displace the resilient member and tauten the diaphragm.

7. A mounting for a diaphragm comprising an annular mounting member, an annular ridge thereon, the face of which is beveled outwardly, an annular channel around said ridge, a second ridge beyond said channel, the face of which is beveled inwardly, a second annular mountin member to cooperate with the first in olding the diaphragm, a resilient gasket to seat between the first mentioned ridge and the diaphragm, and means for causing a relative movement between the annular members to displace the resilient member and tauten the diaphragm.

8. A mountin for a circular diaphra having concentric corrugations, an annuii l ridge thereon, the face of which is beveled outwardly, an annular channel around said ridge, a second ridge beyond said channel, the face of which is beveled inwardly, a second annular mounting member to co-operate with the first in holding the circular diaphra m, a resilient gasket to seat between the rst mentioned ridge and the circular diaphragm, and means for causing a relative movement between the annular members to displace the resilient member and tauten the circular diaphragm.

9. A mounti for a sheet-like article comprising a resilient member, a mounting member having a pocket to allow therein displacementof the resilient member, said pocket extending at right angles to the plane of the article, and means for causing a relative movement of the mounting member and the article to displace the resilient member and tauten the article.

10. A mounting for a sheet-like article comprising a mounting member, a resilient member between said mounting member and said article, a projection on the mounting member to resist displacement of the resilient member, said mounting member having a pocket to allow therein displacement of the resilient member, and means for causing a relative movement of the mounting member of the article to displace the resilient member and tauten the article.

11. A mounting for a sheet-like article comprising a mounting member, a resilient member between said mounting member and said-article, a projection on the mountin member to resist displacement of the resillent member, said mounting member having a pocket to allow therein displacement of the resilient member, said pocket extending at substantially right angles to the surface of the article, and means for causing a relative movement of the mounting member of the article to tauten the article.

In witness whereof, I hereunto subscribe my name this 7th day of June A. D., 1923.

FREDERIC S. KOCHENDORF ER. 

